our senior foreign correspondent, jim sciutto, is in geneva, where the talks are being held. jim, first, what are the expectations today? >> reporter: well, the principal u.s. demand will be for access to this secret nuclear facility that was disclosed last week. but they're not necessarily expecting to come away with that today. the bottom line today may be just an agreement to keep talking. but the u.s. is going to be watching iran very closely. one official told me this morning, they're going to be looking to see if the iranians are serious. and if they're not, the u.s. is going to be looking at sanctions. >> we're hearing, jim, that the u.s. may take the rare step of holding one-on-one talks with the iranians. what's the thinking there? >> reporter: well, the u.s. officials have been talking up that possibility. they say there's going to be a number of opportunities for that today. and it would be a first in the context of these talks. yesterday, you had the visit of the u.s. -- of the iranian foreign minister to washington. him being allowed to visit there. what u.s. off